CVE-2026-25802Public exploitNetwork attack vector

Stored XSS via unsandboxed AI-generated HTML preview

Published Feb 24, 2026 · Updated Feb 24, 2026

Cross-site scripting in QuantumNous New API before 0.10.8-alpha.9 allows remote authenticated users to execute scripts in playground browsers. MarkdownRenderer.jsx passes AI-generated HTML directly to dangerouslySetInnerHTML, so script tags execute instead of being isolated or escaped. Exploitation requires a playground user to view attacker-influenced model output; stored chat records retrigger the script when reopened.

CVSS severity7.6
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in QuantumNous New API before 0.10.8-alpha.9 allows remote authenticated users to execute scripts in playground browsers. MarkdownRenderer.jsx passes AI-generated HTML directly to dangerouslySetInnerHTML, so script tags execute instead of being isolated or escaped. Exploitation requires a playground user to view attacker-influenced model output; stored chat records retrigger the script when reopened.

The record

CVE
CVE-2026-25802
Published
Feb 24, 2026
Updated
Feb 24, 2026
Vendor
QuantumNous
Product
New API
Classifications
T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.10.8-alpha.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

QuantumNous · New APIversion=< 0.10.8-alpha.9

Published CVSS scores

7.6GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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